6533b7d3fe1ef96bd1260135

RESEARCH PRODUCT

Monitoring molecular dynamics of bacterial cellulose composites reinforced with graphene oxide by carboxymethyl cellulose addition

Maria J. SanchisFernando G. TorresM. CarsíK.n. GonzalesClara M. GómezMario Culebras

subject

Materials sciencePolymers and PlasticsOxidemacromolecular substances02 engineering and technologyMolecular Dynamics SimulationDielectric relaxation spectroscopy010402 general chemistry01 natural scienceslaw.inventionMolecular dynamicschemistry.chemical_compoundBacterial cellulose compositeslawMaterials ChemistrymedicineThermal stabilityCelluloseComposite materialCelluloseGrapheneOrganic Chemistrytechnology industry and agricultureOxidesThermal stability021001 nanoscience & nanotechnology0104 chemical sciencesCarboxymethyl cellulosechemistryBacterial celluloseIntramolecular forceCarboxymethylcellulose SodiumMAQUINAS Y MOTORES TERMICOSGraphite0210 nano-technologyTERMODINAMICA APLICADA (UPV)medicine.drug

description

[EN] Broadband Dielectric Relaxation Spectroscopy was performed to study the molecular dynamics of dried Bacterial Cellulose/Carboxymethyl Cellulose-Graphene Oxide (BC/CMC-GO) composites as a function of the concentration of CMC in the culture media. At low temperature the dielectric spectra are dominated by a dipolar process labelled as a beta -relaxation, whereas electrode polarization and the contribution of dc-conductivity dominate the spectra at high temperatures and low frequency. The CMC concentration affects the morphological structure of cellulose and subsequently alters its physical properties. X-ray diffractometry measurements show that increasing the concentration of CMC promotes a decrease of the Ia/Ib ratio. This structural change in BC, that involves a variation in inter- and intramolecular interactions (hydrogen-bonding interactions), affects steeply their molecular dynamics. So, an increase of CMC concentration produces a significantly decrease of the -relaxation strength and an increase of the dc-conductivity.

yearjournalcountryeditionlanguage
2017-01-01
10.1016/j.carbpol.2016.10.001https://doi.org/10.1016/j.carbpol.2016.10.001